Explanation:
Evaluate in the x direction to find the time it takes to land:
x = x₀ + v₀ₓ t + ½ aₓ t²
17.5 = 0 + (15 cos 40) t + ½ (0) t²
t = 1.52
Evaluate in the y direction to find the initial height:
y = y₀ + v₀ᵧ t + ½ g t²
0 = h + (15 sin 40) (1.52) + ½ (-9.8) (1.52)²
h = -3.32
The cliff is actually 3.32 meters below where it lands. Make sure you copied the problem correctly.
Heat is ____ energy that is transferred from one object at a certain temperature to another at a different temperature
Answer: Kinetic or Thermal
which of the following is a helpful process in evaluating scientific claims?
a. quoting statistics
b. making lists
c. biased thinking
d. critical thinking
PLEASE NEED THE ANSWER ASAP!!!!!!!
Answer: D. If you look at the claims with critical thinking then you will be less likely to be fooled by something false
Answer: d. critical thinking
Explanation:
A scientific claim is a statement which is based on evidences obtained after the experimental trials and direct observatory approach of the process occurring in the nature.
Critical thinking based on the approach of verification and analysis can be used to evaluate the scientific claims. The result of evaluation will be reliable and acceptable. The evaluation should not be biased or presumed it will yield inappropriate results.
In a shopping mall, two elevators pass each other moving in opposite directions. Each elevator is moving at the same speed. The relative velocity of one elevator to another is 10 m/s. what is the velocity of each elevator to a person standing on the ground?
Answer:
5 m/s upward and 5 m/s downward
Explanation:
Let's call v the speed of each elevator. So one elevator is moving with velocity +v relative to the ground (the positive sign indicates the upward direction) and the other one with velocity -v relative to the ground (downward direction).
The relative velocity of one elevator to another is 10 m/s, so we can write:
[tex]+v = -v + 10[/tex]
which means
[tex]+2v=10\\v = 5 m/s[/tex]
So the speed of each elevator relative to the ground is 5 m/s, with one moving upward and the other one moving downward.
There are two balloons of charges +3.37 x 10-6 C and –8.21 x 10-6 C. The distance between the two balloons is 2.00 m. Determine the force between the two balloons.
F = 0.06N. Since the charges has different signs the force of atraction between them is 0.06N.
In order to solve this exercise we have to use Coulomb's Law equation which says that the magnitude of each of the electric forces with which two point charges at rest interact is directly proportional to the product of the magnitude of both charges and inversely proportional to the square of the distance that separates them. Given by the equation:
[tex]F = k\frac{|q_{1}q_{2}|}{d^{2}}[/tex]. Where k is the Coulomb's Constant [tex]k = 9x10^{9}\frac{Nm^{2} }{C^{2} }[/tex], q1 and q2 are the charges value in Coulomb (C), and d is the distance between charges in meters (m).
There are two balloons of charges +3.37 x 10-6 C and –8.21 x 10-6 C. The distance between the two balloons is 2.00 m. Calculate the force between the two ballons.
[tex]F = 9x10^{9}\frac{Nm^{2} }{C^{2} } \frac{|(3.37x10^{-6}C)(-8.21x10^{-6}C)|}{(2.00m)^{2}}\\F = 9x10^{9}\frac{Nm^{2} }{C^{2} } \frac{|-2.77x10^{-11}C^{2} )|}{4.00m^{2}}\\F = 9x10^{9}\frac{Nm^{2} }{C^{2} }(6.92x10^{-12})\frac{C^{2} }{m^{2}}\\F = 0.06N[/tex]
Multiple reverberations or reflections of sound can interfere with sound quality.
True
False
Multiple reflection causes interference in the sound quality is a TRUE statement.
Explanation:
The reverberation is the cause of interference which is a prolonged sound wave or can also be termed as resonance of sound waves. The sound wave is reflected in an ample amount of time which leads to absorbance of the wave in the medium, therefore, the quality of sound declines in the propagation of the sound wave.
When a mass on a spring is at maximum displacement, what quantity is at a minimum?
Answer:
The velocity
Explanation:
For a mass-spring system, the total mechanical energy is constant during the motion. The total mechanical energy is sum of the elastic potential energy, U, and the kinetic energy, K:
[tex]E=U+K=\frac{1}{2}kx^2+\frac{1}{2}mv^2[/tex]
where
k is the spring constant
x is the displacement
m is the mass
v is the velocity
Since E must remain constant, we see that when x increases, v decreases, and vice-versa. Therefore, when x (the displacement) is at maximum, v (the velocity) is at minimum (more precisely, it is zero).
Protons are found in the
of the atom.
O A. nucleus
Bmembrane
o C. electron clouds
OD. outside
Answer:
A. nucleus
Explanation:
Protons are found in the nucleus of the atom.
A 0.111 kg hockey puck moving at 55 m/s is caught by a 80. kg goalie at rest. with what speed does the goalie slide on the frictionless ice?
Answer:
0.076 m/s
Explanation:
Momentum is conserved:
m v = (m + M) V
(0.111 kg) (55 m/s) = (0.111 kg + 80. kg) V
V = 0.076 m/s
After catching the puck, the goalie slides at 0.076 m/s.
The speed with which the goalie slide on the frictionless ice is 0.076 m/s.
From the principle of conservation of linear momentum;
Momentum before collision = momentum after collision
Mass of the hockey puck = 0.111 kg
Speed of the hockey puck = 55 m/s
Mass of the goalie = 80 kg
Speed of the goalie = 0 m/s
Following the law of conservation of linear momentum;
(0.111 kg × 55 m/s) + (80 kg × 0 m/s) = (0.111 kg + 80 kg) V
V = (0.111 kg × 55 m/s) + (80 kg × 0 m/s)/ (0.111 kg + 80 kg)
V = 6.105/80.111
V = 0.076 m/s
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My question is in the image below
Answer:
(a) 7.59 V
Explanation:
The current in the circuit is 0, so we can ignore the resistor in the circuit.
Capacitors in series have the same charge, so:
Q₁ = Q₂
C₁ V₁ = C₂ V₂
8.25 V₁ = 14.2 V₂
By Kirchoff's voltage law, the sum of the voltage drops equals the source voltage.
V₁ + V₂ = 12
We have two equations and two variables. Let's solve with substitution.
V₂ = 12 − V₁
8.25 V₁ = 14.2 (12 − V₁)
8.25 V₁ = 170.4 − 14.2 V₁
22.45 V₁ = 170.4
V₁ = 7.59
A cubical wooden box floating on water rises 1cm when 400 gm of stone is
removed from it. What will be volume of this box?
Answer:
Explanation:
I'm not sure you can do this without just a bit more information. I can tell you what the mass of the water is when the rocks are removed. When we know that, we know the volume of the water that was displaced. whether or not this is enough information to determine the volume of the box, I'm not sure.
400 grams raises the box 1 cm.
The density of water = 1 gm / cm^3
400 grams of water = 400 mL or 400 cm^3
The volume of the displaced water = 400 cm^3
The volume a slice from the square prism is B*h
B = 400 cm^2
h = 1 cm
If the base is 400 cm^2 then each side is
s^2 = 400
sqrt(s^2)= sqrt(400)
s = 20
The volume of the box is 20^3 = 8000 cm^3
when a force of 5N acts on a surface, it produces a pressure of 500pa. what is the area of surface
Force that acts on area is defined as pressure,
[tex]p=\dfrac{F}{A}[/tex]
If we solve for area,
[tex]A=\dfrac{F}{p}[/tex]
Now put in the data.
[tex]A=\dfrac{5N}{500Pa}=\boxed{0.01m^2}[/tex]
The area of surface is 0.01m^2
Hope this helps.
r3t40
The Biot-Savart force law deals specifically with:
a/the magnetic field surrounding a long, straight wire
b/ currents induced in a conductor
c/ the duplication of poles in a bisected bar magnet
d/ the force between magnetic poles
Answer: a. the magnetic field surrounding a long, straight wire
Explanation:
The Biot-Savart law was formulated by Jean Baptiste Biot and Felix Savart and describes how a magnetic field is generated by a stationary electric current.
In other words:
The law formulated by Biot and Savart relates the magnetic fields with the currents that create them.
Therefore, the correct option is a.
The magnetic field surrounding a long, straight wire.
Answer:
a) the magnetic field surrounding a long, straight wire
Explanation:
The Biot-Savart force law states that when an electrical conductor is passed through an electric current, a magnetic field will spontaneously appear around it. A characteristic of this magnetic field is that it is constituted by lines of force that are circular so that we can place compasses at different points at the end of the field and the north of each one will always face the tangential direction of the lines of the field.
This effect was discovered by Hans Christian Oersted, who realized through experiments that a magnetic needle positioned parallel to an electrical conductor would undergo significant deflection in relation to its original position. We can know the direction and direction of the magnetic field generated through the Right Hand Rule and its value at different points through the Biot-Savart Law.
It's the year 2078, and you're traveling from Earth to the Moon. To determine how much fuel you need for
the rocket ship, you measure your mass upon boarding. When you land on the Moon, your
hasn't changed. Your
, however, has changed. You feel lighter because the
gravity is lower
Answer:
It’s the year 2078, and you’re traveling from Earth to the Moon. To determine how much fuel you need for the rocket ship, you measure your mass upon boarding. When you land on the Moon, your Mass hasn’t changed. Your Weight, however, has changed. You feel lighter because the Force of gravity is lower.
Explanation:
I got this right on Edmentum. Have a great day and I hope this helped!
Your mass remains the same when traveling from Earth to the Moon, but your weight decreases because the Moon's gravity is weaker. Weight is a measure of the force of gravity, which is weaker on the Moon. However, mass is not influenced by gravity and therefore remains constant.
Explanation:The subject in question relates to the concept of mass and weight and how they are affected by changes in gravity. When traveling from Earth to the Moon as mentioned in your scenario, your mass remains the same, but your weight changes because weight is a measure of the force of gravity on your mass. The value of gravity on Earth is 9.8 m/s² whereas on the Moon it is only 1.67 m/s², which is much less. Therefore, you would feel lighter on the Moon because the gravitational pull is weaker, causing you to weigh less. This change in weight doesn't mean your mass has lowered; mass remains consistent regardless of the gravitational pull.
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What's the differentiating characteristic between an element and a compound
Answer:
an element is a pure substance whereas a compound is a mixture of two or more elements.
The basic difference between a compound and an element is its constituents, in which the element is a pure individual chemical substance which has similar atom and compound is a mixture of two or more elements bounded chemically.
Explanation:
Elements:
Elements are pure homogenous substance. Elements have similar atoms grouped together. Element is being represented with the chemical scientific symbol.Compounds:
Compound are heterogeneous mixture of elements. Compound has different atoms which is combined in fixed ratio. Compound is given by chemical formula.Which nucleus completes the following equation?
Answer:
D
Explanation:
Whatever question mark is, it will have to have a 1 taken away from the atomic number of Br.
The atomic mass of the electron doesn't change anything, so whatever ? is, it has a mass of 85.
Since ? is 85 / 34 Se, the answer much be D
Answer:
85 36 Kr
Explanation:
yeah
A long uniform thin rod of length 55 cm and mass 1.2 kg in FIGURE 2 rotates in
the plane of the figure about an axis through one end of the rod. As the rod
swings through its lowest position, it collides with a 200 g putty wad that sticks to the end of the thin rod. Given the rod's angular speed just before the collision is 3 rad/s. Calculate
(i) the moment of inertia of the long thin rod.
(ii) the initial angular momentum of the system before the collision.
(iii) the angular speed of the rod-putty wad system immediately after collision.
Answer:
(i) 0.121 kg m²
(ii) 0.363 kg m²/s
(iii) 2 rad/s
Explanation:
(i) The moment of inertia of a rod about its end is:
I = 1/3 mr²
where m is the mass and r is the length.
Given m = 1.2 kg and r = 0.55 m:
I = 1/3 (1.2 kg) (0.55 m)²
I = 0.121 kg m²
(ii) Angular momentum is the moment of inertia times the angular velocity:
L = Iω
L = (0.121 kg m²) (3 rad/s)
L = 0.363 kg m²/s
(iii) This time, the moment of inertia of the putty is included.
I = 1/3 mr² + Mr²
I = 0.121 kg m² + (0.2 kg) (0.55 m)²
I = 0.1815 kg m²
Angular momentum is conserved:
L = Iω
0.363 kg m² = (0.1815 kg m²) ω
ω = 2 rad/s
A bobcat jumps with a speed of 5 m/s at an angle of 55º. How long does the
bobcat stay in the air?
Answer- 0.84 s
Explanation:
y = y₀ + v₀ᵧ t + ½ gt²
where y is the final height,
y₀ is the initial height,
v₀ᵧ is the initial vertical velocity,
g is the acceleration due to gravity,
and t is time.
0 m = 0 m + (5 sin 55º m/s) t + ½ (-9.8 m/s²) t²
0 = 4.10 t − 4.9 t²
0 = t (4.10 − 4.9 t)
t = 0, t = 0.84
The bobcat lands after 0.84 seconds.
Answer:
0.84
Explanation:
Apex ; good luck with your tests!
An object floats in liquid of density 1.2×10kgm/3 with one quarter of its volume above the liquid surface. Determine the density of the object
Answer:
900 kg/m³
Explanation:
There are two forces on the object: weight and buoyancy.
Newton's second law:
∑F = ma
B − W = 0
B = W
Weight is mass times gravity:
W = m₀ g
Mass is density times volume:
W = ρ₀ V₀ g
Buoyancy force is equal to the weight of displaced fluid:
B = ρ V g
Therefore:
ρ V g = ρ₀ V₀ g
ρ V = ρ₀ V₀
ρ₀ = ρ V / V₀
One quarter of the object's volume is above the liquid, which means three quarters of its volume is below the surface.
Given that V = ¾ V₀ and ρ = 1200 kg/m³:
ρ₀ = 1200 (3/4)
ρ₀ = 900 kg/m³
importance of electrical symbol
Electrical symbols in circuit diagrams are crucial for understanding and communicating complex electrical concepts and layouts. They represent key components like wires, power sources, resistors, and ground in a standardized, universally understood format. This foundational knowledge is essential for anyone in the field of electrical engineering or anyone interfacing with electrical technology.
Explanation:The importance of electrical symbols in circuit diagrams and the broader field of electrical engineering cannot be overstated. These symbols serve as a universal language that allows scientists, engineers, and technicians to succinctly communicate complex electrical concepts and circuit layouts without the need for lengthy explanations. The main symbols in circuit diagrams include the wire, which represents the pathway for electrical flow; the battery or voltage source, supplying the energy; resistors, which control the flow of electric current; and the ground, indicating a common return path for an electrical current.
Understanding these symbols and their applications is crucial for anyone involved in the study or practice of electrical engineering. Electrical schematics simplify the analysis of circuits, which can range from simple battery connections in small devices to complex electric circuits in high-tech equipment. This simplified representation is essential for designing, troubleshooting, and improving electrical systems. Moreover, the advancement in electrical science significantly owes to the standardized terminology and symbolism that emerged over the past few decades, making it easier for professionals to communicate their ideas and understandings effectively.
Lastly, in the real world, we depend heavily on electricity and electrical appliances, making the study of electrical circuits vital. Knowledge of these symbols and how to interpret circuit diagrams equips individuals with the ability to understand the workings of everyday technology, from computers to household appliances, especially in troubleshooting and maintenance.
distance is a vector quantity ... true or false
Answer:
False
Explanation:
Distance is a sclalar quantity as it has only magnitude and no dirction.
Vector quantities have both magnificent and direction.
HOPE IT HELPS....
It is false that Distance is a vector quantity. Distance is not a vector quantity; it is a scalar quantity. Scalar quantities are physical quantities that have only magnitude and no direction.
They are described completely by their numerical value and units.
On the other hand, vector quantities have both magnitude and direction, and they are represented by arrows in a specific direction. Examples of vector quantities include displacement, velocity, acceleration, force, and momentum.
When we talk about distance, we are only concerned with the total length or magnitude of the path traveled by an object or the space between two points, without regard to the direction of motion. Since it lacks a specific direction, distance is considered a scalar quantity.
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which one of the following is not a step in the inquiry process
A. Investigate
B. Classify
C. Summarize
D. Observe
Answer: (B) Classify
Explanation:
The classify is not the part of the inquiry process as the inquiry process are basically based on the different types of observations and then summarize it properly after the investigation. Without any observation we cannot classifying the specific things.
The inquiry is the process that include investigation planning and making the proper observation about the incident.
Then, collect all the related information and summarize all the process. It also include analyzing process, interpretation of the data and reviewing process.
Therefore, option (B) is correct.
QUESTION 4
What would be the BEST response to constructive criticism?
Tell others about that person's faults.
Calmly walk away from the person.
Make the discussion more fair by telling the person about his or her faults.
Evaluate the criticism for truthfulness, then talk about it without being defensive.
QUESTION 5
What key ingredients promote effective collaboration when working with a team of people?
asking questions, making assumptions, and helping others
honesty, openness, consistency, and respect
valuing diversity, addressing hate crimes, and reading
communicating passively, scheduling, and leading
What is the correct definition of momentum, p =
Question 18 options:
The momentum of an object is the product of its mass and its velocity.
The momentum p is related as, p = mv
Explanation:
Momentum of an object is defined by the two variables;
(i) mass of the object
(ii) velocity at which the object travels.
Hence momentum is the product of the above two variables it is directly proportional to them and it is represented by the unit (kg.m) / s where kg represents the mass of the object, m / s for velocity of the object.
An alloy of gold and silver has a mass of 1050g and a volume of 60cm cubic .if the density of gold is 19.3g/cm cubic and that of silver is 10.5g/cm cubic. Find the mass of gold
Answer:
921 g
Explanation:
If S is the mass of silver and G is the mass of gold, then the total mass is:
S + G = 1050
And the total volume is:
S/10.5 + G/19.3 = 60
Using substitution:
S = 1050 − G
(1050 − G)/10.5 + G/19.3 = 60
(1050 − G) (19.3) + G (10.5) = 60 (19.3) (10.5)
20265 − 19.3G + 10.5G = 12159
8106 = 8.8G
G = 921.1
Rounded to 3 significant figures, the mass of the gold is 921 grams.
The mass of gold in the alloy can be determined by using the given alloy mass, volume, and the known densities of gold and silver. By setting up the appropriate equations and solving, we find that the alloy contains approximately 816.4g of gold.
Explanation:The mass (M) is the total amount of gold and silver present in the alloy and can be represented as M = M_gold + M_silver, where M_gold and M_silver are the masses of gold and silver respectively. Given that the total mass of the alloy is 1050g, and the total volume is 60cm³, we can calculate the mass of gold using the known densities for gold and silver (19.3g/cm³ and 10.5g/cm³ respectively).
The volume of each metal in the alloy is given by the formula: Volume = Mass/Density. Therefore, for the alloy, we have 60cm³ = M_gold/19.3g/cm³ + M_silver/10.5g/cm³. We know that M_silver = 1050g - M_gold. Substituting M_silver into the volume equation and solving for M_gold yields a value of approximately 816.4g of gold in the alloy.
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A uniform metre rule of mass 200g is pivoted at 0cm mark. Calculate the force which would be applied vertically up at the 60cm mark to keep the rule horizontal
Explanation:
There are two forces acting on the ruler: weight pulling down halfway at the 50cm mark, and the upward force at the 60cm mark.
Sum of the moments about the pivot:
∑τ = Iα
F (0.60) − (0.200) (9.8) (0.50) = 0
F = 1.63 N
Answer:
The force needed is 1.7N
A spectroscope creates a spectrum, or array of colors, based on the light emitted by a star. How are
scientists able to use these colors to determine which elements the star contains?
If you could travel at the speed of light, how long would it take to travel from our solar
system to the nearest star?
Answer:
4.689 years
Explanation:
Traveling at light speed, it takes about 4.2 years to reach the nearest star from our solar system.
If you could travel at the speed of light, how long would it take to travel from our solar system to the nearest star?
Traveling at the speed of light, it would take approximately 4.2 years to reach the nearest star Alpha Centauri, which is 4.2 light-years away. This is due to the distance light needs to travel to cover the expanse between our solar system and the star.
what is Linkedin and how you can look for jobs and network with others in your career field?
Answer:
LinkedIn is a social community, or social network where connections are created between employers and employees.
A typical user creates an account, fill in their employment history, achievements and personal goals, and starts making contact with people that work in similar fields and could offer potential job opportunities.
LinkedIn is a popular tool for people looking to find jobs and new positions. You talk to people in your chosen career field, in different geographic areas, and once they look at the profile you have created, you could become a potential candidate for a job offer.
label the samples based on their pH levels
In Chemistry, pH levels can be determined using acid-base indicators or pH paper which change color to reflect the acidity or alkalinity of a solution. Substances with pH less than 7 are acidic, while those with pH over 7 are basic. The concentration of hydrogen ions can also be used to determine pH.
Explanation:The pH level of a substance can be determined using acid-base indicators or pH paper which change color in relation to the acidity or alkalinity of the solution. The pH scale measures from 0 to 14, with 7 being neutral. Anything below 7 is considered acidic, and anything above 7 is basic or alkaline. For example, if using pH paper or an indicator, a solution that colors the paper or indicator red or orange is likely to be acidic, whereas a green or blue color suggests a basic solution. The specific color can provide a rough estimate of the pH value, with some indicators or pH papers providing more precise value ranges.
Another method to measure pH is by examining the concentration of hydrogen ions in the solution. A lower pH value indicates a higher concentration of hydrogen ions, making the solution more acidic. Conversely, a higher pH value indicates a lower concentration of hydrogen ions, making the solution more basic or alkaline.
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I NEED PHYSICS HELP? THE QUESTION IS IN THE PIC
Speed of the block at the bottom of the incline: 5.42 m/s
The first part of the problem can be solved by using the law of conservation of energy. Since the ramp is frictionless, the initial gravitational potential energy of the block at the top of the ramp is converted into kinetic energy at the bottom:
[tex]mgh = \frac{1}{2}mv^2[/tex] (1)
where
m is the mass of the block
g = 9.8 m/s^2 is the acceleration of gravity
h is the initial height of the block
v is the speed of the block at the bottom
The initial height of the block is equal to the height of the ramp, so
[tex]h=L sin \theta[/tex] (2)
where
L = 3.00 m is the length of the ramp
[tex]\theta=30^{\circ}[/tex] is the angle of the ramp
Substituting (2) into (1) and re-arranging the equation, we find the speed
[tex]2gL sin \theta = v^2[/tex]
[tex]v=\sqrt{2gL sin \theta}=\sqrt{2(9.8)(3.00)sin 30^{\circ}}=5.42 m/s[/tex]
Coefficient of kinetic friction between the floor and the block: 0.3
In the second part of the motion, the block is slowed down by friction along the flat surface. According to the work-energy theorem, the work done by friction is equal to the change in kinetic energy of the block:
[tex]W=\Delta K=K_f -K_i[/tex]
where
W is the work done by friction
Kf is the final kinetic energy of the block, which is zero since the block comes to rest
[tex]K_i = \frac{1}{2}mv^2[/tex] is the initial kinetic energy of the block, where
m = 10.0 kg is the mass of the block
v = 5.42 m/s is its initial speed
Substituting into the equation, we find
[tex]W=-\frac{1}{2}mv^2=-\frac{1}{2}(10.0)(5.42)^2=-146.9 J[/tex]
and the work is negative, since the direction of the force of friction is opposite to the direction of motion of the block.
Now we can rewrite the work as the product between the force of friction and the displacement of the block:
[tex]W=-F_f d = - \mu mg d[/tex]
where
[tex]\mu[/tex] is the coefficient of friction
d = 5.00 m is the displacement of the block
Solving for [tex]\mu[/tex],
[tex]\mu = - \frac{W}{mgd}=-\frac{-146.9}{(10.0)(9.8)(5.00)}=0.3[/tex]